Improvement in tuck-creasers for sewing-machines



UNITED STATES PATENT GFEICE.

sYLvEsTEE nBABcooK, or ADRIAN, MICHIGAN.

' VuvwnovrlviENT IN TucK-cREAsERs FoR SEWING-MACHINES.

Specification forming part of Letters Patent No. 143,741, dated October21,'1873 application filed May 17, 1873.

description thereof, reference being had to the accompanying drawings,and to the letters of reference marked thereon, and being a part of thisspecification, in which- Figure 1 is a perspective view. Fig. 2 is a Iperspective view of the creasing devices depressed, as when compressinga fold in the fabric. Fig. 3 is a partial side elevation of thecreaser-plate with the fabric lying thereon, showing the tuck previouslymade folded under the creaser-plate, a tuck in process of being stitcheddown, and the fabric lying on the creaser-stud ready to be creased.

Like letters refer to like parts in the several figures.

The nature of this invention relates to an improvement in tuck-markingattachments'to sewingmachines of that class wherein a series of creasesare formed in the fabric on the line on which it is to be subsequentlyfolded 5 and it consists in certain details of construction fullydescribed hereinafter.

In the drawing, A is the base-plate, which is secured to the cloth-plateof the sewing-machine by a thumb-screw passing through the hole a. B isa gageplate, sliding in grooves I formed by turning'up the sides of thebaseplate. b is the guide or gage for the fabric to be stitched and isformed by turning up the front edge of the plate B, which has also alongitudinal slot, through which the thumbscrew passes. The foregoingparts being already commonly known and used their oflice requires noexplanation here. Gis a pressure-` bar of sheet metal, slightly curvedin crosssection, except at the front end, with its convex sideuppermost, and, sliding on the gageplate, is secured thereto by aset-screw, l). The front end of the pressure-bar is fiat, and is bentbackupon itself, the upper part, forming the pressure-plate O1, havingan open space underneath. From its surface a short and thin stud, d,projects upward. At the back end of the bar a T-shaped plate, G2, isriveted thereto,

carrying two posts, E, in which is journaled the rear end of thevibrating presser-arm F, bent to a right angle with its main part, andthrown upward by a helical spring, e, coiled about the arm. The frontend is also bent in wardly at a right angle with the main part; and f isthe tie-piece through which. the needle passes, the presser-arm beingdepressed by the down stroke of the needlebar of the sewing-machine. Atthe near end of the plate C2 is riveted to its under side aspring-plate, G, to serve as a cloth-smoother. It being in common use Idisclaim the invention thereof. Above it a long narrow plate, H, issecured to the said plate C2, (curved in cross-section to make itsti'en) and to its front end I secure the lateral creaser-plate I, whichcomes over the pressure-plate C1, its edge coming behind the studthereon. This plate I has two lugs, i, punched outwardly from its face,in and through which a horizontal rock-shaft, h, is journaled, and towhich a rocker-arm, J, is riveted, its shorter arm having a notch,j,'cut out of it, where it passes behind and below the rockshaft,forming a jaw which sweeps by the stud on the pressure-plate below, whenthe rockerarm is depressed by the descending presserarm F. A spring, lo,coiled aroiuid the rockshaft, with its bale pressing under therockerarm, throws the latter upward, and keeps the jaws retracted fromthe fabric until the creaserplate I strikes the pressure-plate C1, whena continued pressure will depress the long arm of the rocker J, andforce its jaw past the stud, gathering a fold in the fabric, andcreasing it by drawing it forcibly around the stud d against thecreaser-plate I, whereby a close succession of well-dened creases aremade in the fabric.

By journaling the presser-arm in the posts, as shown and described, theup throwing spring need only be strong enough to lift it, and thus offerbut little resistance to the needie-arm of the machine, as it cannotsway laterally, by reason of its long bearings 5 hence it does notrequire a stijf spring to resist any tendency to bend it laterally. A

What I claim as my invention, and desire to secure by Letters Patent, is

The movable pressure-bar and plate C Cl,

the latter carrying the stud d, the plato G2, struotod and operating asand for the purpose posts E E, presser-arm F, spring e, and toset forth.

piece j', the oreaser-bar H, oreasenplate I hav- SYLVESTER P. BABGOCK.fing the rook-shaft l journaled in its lugs i z',

the rockenarm J having a notch, j, in its Witnesses:

shorter arm, and the spring k in connection S. M. BABCOOK,

with the base-plate A and gage-plate B7 con- S. E. GRAVES.

